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Author Topic:   float type??
dirtbuster
Dirt Freak

Total posts: 353
posted February 20, 2003 03:31 PM
What is everyones experience with different types of floats for alky carbs. Brass, plastic, nitrophyl, etc.?

I need to get new floats for an alky carb and would like to know if any are better than others.

Does most everyone run oval track cut floats? For some reason my Demon came from the factory with standard floats even though it was supposed to have oval track floats according to the BG tech line. I will prob order vut floats unless thereis a problem with them.

KPLugnut
Dirt Freak

Total posts: 408
posted February 20, 2003 03:41 PM
We recommend not putting "cut" floats in an alky carb because of the epoxy used on them gets eaten away by the alky.
Brass, or plastic are good choices for basic alky carb floats.
If you want to spend $16 each, Braswell will sell you nitrophyl floats that are molded with a bevel on one side, or both.
We stock all types of floats, BTW. But the most common thing used in alky carbs these days is just the brass ones because they do not ever sink and stand up to the rather caustic qualities of alky.

Hope that helps,
KPLugnut

Alltel
Dirt Full Roller

Total posts: 39
posted February 20, 2003 04:55 PM
We always ran the brass circle track floats with gas, but when we went to alky, we kept crushing the floats(about 3 of them before we changed). When that happens, it floods so bad that the methanol was coming through the air breather and hitting me in the face. We went to the nitrofil cirle track floats and haven't had a problem since.

KPLugnut
Dirt Freak

Total posts: 408
posted February 21, 2003 08:50 AM
The only thing that crushes a float is a severe backfiring of the motor. That is also what destroys power valves if there is no PV protection kit installed in the baseplate....and even then I've seen them not protect fully from it.
Brass floats will last forever assuming the motor doesn't backfire.
The nitrophyl floats that are molded with a bevel on the right side (to compensate for cornering forces and fuel shift in the corners) are the ONLY nitrophyl floats that will work with alky. Ones that have been cut and a layer of epoxy applied as a new "skin" over the cut area will NOT work with alcohol since the alky will destroy the epoxy and cause it to flake off, plugging jets and passages, and allowing the float to become saturated and then sink.

There is no such thing as an "oval track brass float". They are the stock brass float used in all Holley center hung bowls.

Braswell sells what they are calling a "severe duty" nitrophyl float for oval track uses. It is at least $16 for one float, and the only difference between it and a standard nitrophyl float is that it is molded with the bevel on the right side (or both sides for road racing uses) and it has a bit of a harder "skin" over the surface of the material which tends to resist dents, scratches and punctures.

Hope that helps,

KPLugnut

dirtbuster
Dirt Freak

Total posts: 353
posted February 21, 2003 10:32 AM
When i said cut floats I meant factory made beveled floats not hand cut and epoxied.

Will all nitrophyl floats eventually soak fuel/alky? Should they be replaced on a regular basis anyway?

How about moroso oval track float kit #65432

There must be an advantage to the beveled floats or not? If there isnt I may just get standard floats for half the price.

[This message has been edited by dirtbuster (edited February 21, 2003).]

KPLugnut
Dirt Freak

Total posts: 408
posted February 21, 2003 03:46 PM
Yes, all nitrophyl floats (from my experience) have a tendency to absorb fuel over time. Even though it doesn't appear that way, they are a porous material.
I believe the Moroso floats are molded with the bevels just like you were describing, and yes, they'll work fine.
The slight advantage a bevel'd float has is that when the fuel moves to one side in the corners, it doesn't affect float levels nearly as much as it does with the standard float (brass, nitrophyl or plastic).
Anyway, I apologize for misunderstanding that you were not speaking about "cut" floats being epoxied/homemade ones.

KPLugnut

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